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Preparation method of nanoparticle-enhanced refrigerant hydrate phase-change cold storage working medium

A technology of nano-particles and phase change cold storage, which is applied in the direction of chemical instruments and methods, heat exchange materials, etc., can solve the problem of shortening the induction time of nucleation, and it is not large, so as to reduce the volume effect of phase change and simplify the cold storage equipment , Reduce equipment costs and the effect of operating power consumption

Inactive Publication Date: 2011-12-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Li Jinping (Li Jinping, Wu Jiang, Liang Deqing, et al. Experimental research on gas hydrate formation process in nanofluids, Journal of Xi'an Jiaotong University, 2006, 40(3): 365-368; Li Jinping, Wang Lipu, Wang Chunlong, et al. The formation process of HFC134a hydrate in fluid, Journal of Lanzhou University of Technology, 2007, 5 (33): 48-50) research shows that adding nano-copper particles in the rough mixing system with sodium dodecylbenzene sulfonate as dispersant can Shorten the growth time after R141b and R134a gas hydrate nucleation, but have little effect on shortening the nucleation induction time
According to the current public reports, there are no reports on adding nanoparticles to thermodynamically stable microemulsions to reduce the induction time and subcooling degree of gas hydrate formation in the microemulsion system, and to achieve rapid and large-scale formation of hydrates.

Method used

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  • Preparation method of nanoparticle-enhanced refrigerant hydrate phase-change cold storage working medium
  • Preparation method of nanoparticle-enhanced refrigerant hydrate phase-change cold storage working medium
  • Preparation method of nanoparticle-enhanced refrigerant hydrate phase-change cold storage working medium

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Effect test

Embodiment 1

[0031] Embodiment 1: firstly, surfactant Tween-20 is dissolved in water to obtain an aqueous solution containing Tween-20 mass percentage concentration of 26%; then lecithin is dissolved in refrigerant R141b to obtain lecithin-containing R141b solution with a mass percent concentration of 12%; in a water bath at 10°C, press R141b:H 2 The mass ratio of O is 28:100. The above-mentioned R141b solution containing lecithin is added dropwise to the aqueous solution containing Tween-20, and the solution is stirred until it changes from turbid to clear, and then 0.1% by mass, average particle size Nano-copper particles of 20nm were stirred magnetically for 15 minutes under the conditions of 10°C and 200r / min, and dispersed by ultrasonic wave in a 10°C water bath for 10 minutes to obtain nanoparticle-enhanced R141b hydrate phase-change cold storage refrigerant.

Embodiment 2

[0032] Embodiment 2: first surfactant Tween-80 and OP-10 are dissolved in water, and it is respectively 15% and 10% aqueous solution that makes containing Tween-80 and OP-10 mass percent concentration; In 15 ℃ of water baths In, according to R141b: H 2 The mass ratio of O is the ratio of 10:100. Add the R141b solution dropwise to the aqueous solution containing Tween-80 and OP-10, stir the solution until it changes from turbid to clear, then add 0.05% by mass, and the average particle size is Nano silver particles of 10nm were stirred magnetically for 10 minutes under the conditions of 15°C and 300r / min, and dispersed by ultrasonic wave in a 15°C water bath for 15 minutes to obtain nanoparticle-enhanced R141b hydrate phase change cold storage refrigerant.

Embodiment 3

[0033] Embodiment 3: first surfactant Tween-40 and OP-10 are dissolved in water, and it is respectively 28% and 3% aqueous solution to make containing Tween-40 and OP-10 mass percent concentration; Then lecithin Dissolve in refrigerant R123 to prepare a R123 solution containing 8% lecithin mass percentage concentration, in a water bath at 10°C, press R123:H 2 The mass ratio of O is 15:100. Add the above-mentioned R123 solution containing lecithin dropwise to the aqueous solution containing Tween-40 and OP-10, stir the solution until it changes from cloudy to clear, and then add 1% by mass , Nano-iron oxide particles with an average particle size of 40nm, magnetically stirred at 10°C and 150r / min for 10min, and ultrasonically dispersed in a water bath at 5°C for 10min to obtain nanoparticle-enhanced R123 hydrate phase-change cold storage refrigerant.

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Abstract

A method for preparing nanoparticle-enhanced refrigerant hydrate phase-change cold storage refrigerants, using the solubilization effect of compound surfactants, dissolving refrigerants in water to prepare thermodynamically stable refrigerant microemulsions, and then dispersing nanoparticles In the refrigerant microemulsion, a refrigerant hydrate phase-change cold storage working substance strengthened by nanoparticles is prepared. By stably dispersing nanoparticles in the refrigerant microemulsion system to enhance heat and mass transfer, increase the reaction interface, and induce heterogeneous nucleation, thereby significantly reducing the induction time and subcooling degree of hydrate formation, effectively achieving crystallization effect. The product of the invention can be widely used in fields such as peak shifting of electric power, building energy saving, cold storage air conditioner, refrigeration and preservation of agricultural products and biological products, high and low temperature cold storage and refrigerated logistics, etc., and can achieve the purpose of effective cold storage and release of cold and rational use of energy.

Description

technical field [0001] The invention relates to a preparation method of a phase-change cold-storage working medium with high thermal conductivity, in particular to a preparation method of a refrigerant hydrate phase-change cold-storage working medium using nanoparticles as a heat conduction enhancing medium. Background technique [0002] Gas hydrate is a crystalline substance with an ice-like cage structure formed by water and gas or volatile liquid at a certain temperature and pressure, which can be used for energy storage. Refrigerant gas hydrate is a new generation of cold storage working fluid with good development prospects. In the actual application process, it is hoped that the refrigerant cold storage working fluid can quickly generate a large amount of hydrate, and the lower the subcooling degree of hydrate nucleation, the better. However, due to the fact that most of the refrigerants are insoluble in water and the diffusion speed in water is slow, the hydrate forma...

Claims

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Application Information

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IPC IPC(8): C09K5/16
Inventor 李娜马振魁
Owner XI AN JIAOTONG UNIV
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